Reasons For

The Samsung UE43KU6079 is an 8.8kg heavy TV. That's 1.7kg lighter than the Samsung UE43KU6400 (10.5kg).
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The weight is the total weight of the TV excluding all packaging.

A lighter weight TV will be easier to move around and to mount on a wall. Some of the larger, very heavy TVs may require lightweight partition walls to be reinforced before the TV could be mounted.

Better energy efficiency rating

The energy efficiency rating of the Samsung UE43KU6079 is "A", however the rating of the Samsung UE43KU6400 is "A".

6 Reasons For

7.2mm thinner
Edit

The Samsung UE43KU6400 is a 55.4mm thick TV. That's 7.2mm thinner than the Samsung UE43KU6079 (55.4mm).
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The depth of the TV is the thickness of the TV measured from the back of the TV to the front of the TV. Curved TVs will have quite a big depth as this dimension is measured from the back of the centre of the screen to the front of the edges of the screen.

A thinner TV has the advantage of appearing more elegant and will also mean that the TV will not stick out as much when mounted on a wall.

The Samsung UE43KU6400 ranks No. 122392 by number of sales, but the Samsung UE43KU6079 ranks No. 167639.

Energy efficiency rating is higher

The Samsung UE43KU6400 has an energy efficiency rating of "A", but the Samsung UE43KU6079 has a rating of "A".

Reasons Against

5 Reasons Against

Thicker
Edit

Samsung UE43KU6079 is 62.6mm thick, but the Samsung UE43KU6400 is a 55.4mm thick TV (7.2mm thinner).
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The depth of the TV is the thickness of the TV measured from the back of the TV to the front of the TV. Curved TVs will have quite a big depth as this dimension is measured from the back of the centre of the screen to the front of the edges of the screen.

A thinner TV has the advantage of appearing more elegant and will also mean that the TV will not stick out as much when mounted on a wall.

£26 more expensive

The Samsung UE43KU6079 is more expensive than the Samsung UE43KU6400 by £25.75.